Income Taxes - Schedule of Significant Components of Company's Net Deferred Tax Assets/(Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Deferred tax assets:
Allowance and reserves	$ 26	$ 27
Employee benefits and compensation	82	80
Other accruals	66	45
Property, plant and equipment	61	61
Operating lease liabilities	62	69
Tax attribute carryforwards	74	62
Deferred revenue and debt	9	14
Investment in subsidiaries	27	0
Total deferred tax assets	407	358
Less: Valuation allowance	(51)	(25)
Deferred tax assets, net of valuation allowance	356	333
Deferred tax liabilities:
Royalty advances	(52)	(34)
Operating lease right-of-use assets	(49)	(57)
Accrued royalties	(50)	(52)
Intangible assets	(236)	(284)
Debt and other	(22)	(49)
Total deferred tax liabilities	(409)	(476)
Net deferred tax liabilities	$ (53)	$ (143)